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Performance of Some Pre Emergence Herbicides Against Weeds in Winter Rice

Rakiba Shultana
Scientific Officer
Agronomy Division, Bangladesh Rice Research Institute

Md. Abdullah Al-Mamun
Scientific Officer
Agronomy Division, Bangladesh Rice Research Institute

Saleque Ahmed Rezvi
BRRI Branch, Sonali Bank Limited, Gazipur

Mst. Selima Zahan
Scientific Officer
Agronomy Division, Bangladesh Rice Research Institute

Abstract/ Executive Summary:

An experiment was conducted at Bangladesh Rice Research Institute, Gazipur, during winter season 2009 to evaluate the weed control efficiency of some pre-emergence herbicides in transplanted rice. Among the treated herbicides, four were from pretilachlor, twofrom butachlor, one from oxadiazon and one from bensulfuron methyl + acetachlor group. One herbicide from pretilachlor and one from oxadiazon group were used for standard comparison as well. No phytotoxic effects were observed on the treated plots. Echinochloa crusgalli was found as the most dominating weed in all the treated rice plots and the most prevalent weed was Scirpus maritimus. Among the evaluated herbicides, Rigid 50 EC (pretilachlor) @ 1L, Alert 18 WP (bensulfuron + acetachlor) @ 400 g, Kildor 5G (butachlor) @ 25 kg, Bigboss 500 EC (pretilachlor) @ 1L, Rifit 500EC (pretilachlor) @ 1L, Ravchlor 5G (butachlor) @ 25kg, Succour 50 EC (pretilachlor) @ 1L and Topstar 80 WP (oxadiazon) @75 g ha^-1 showed above 80% weed control efficiency. Similarly, the grain yields were above 4 t ha^-1 in the aforesaid treatments which were comparable to the standard check; however, weed free plots gave the highest grain yield as anticipated.

Keywords: Herbicides, Performance, Weed control, Weeds, Winter rice

Location: Experimental Farm of Bangladesh Rice Research Institute, Gazipur

Start Date: 00-00-2009

End Date: 00-00-2009

Program Area: Pest Management

Commodity: Herbicide

Objectives:

To evaluate the weed control efficiency of eight pre emergence herbicides in transplanted rice.

Methodology:

An experiment was conducted at Bangladesh Rice Research Institute, Gazipur, during winter season (Boro season) 2009 to evaluate the weed control efficiency of eight pre emergence herbicides in transplanted rice. The experiment was carried out with 12 different weed management treatments viz. the herbicides of pretilachlor group were: Rigid 50 EC @ 1 L, Bigboss 500 EC @ 1 L, Rifit 500 EC @ 1 L, and Succour 50 EC @ 1 L ha^-1; whereas those of butachlor group were Kildor 5 G @ 25 kg, and Ravchlor 5G @ 25 kg ha^-1, of oxadiazon group was Topstar 80 WP @ 75 g ha^-1, of bensulfuron + acetachlor group were Alert 18 WP @ 400 g, Ronstar 25 EC @ 2 L (standard check), Rifit 500 EC @ 2 L ha^-1 (standard check), a weed free, and an unweeded control. The experiment was laid out in randomized complete block design (RCBD) having three replications. The rice variety BRRI dhan29 was used in this study. A common procedure was followed for raising seedling in seed bed. Seedlings of 35 days old were transplanted according to treatments in the well puddled experimental plots. Spacings were given 15 cm x 20 cm. A fertilizer dose of 80-50-50-10 kg ha^-1 of N, P₂O₅, K₂O and S were applied in the field as urea, TSP, MOP and gypsum. One third urea and full dose of TSP, MOP and Gypsum as basal dose during final land preparation and incorporated well into the soil. Rest two third of Urea was applied in two equal splits at 30 and 55 days after transplanting. All intercultural operations were done carefully. Hand weedings were done as per treatments. All herbicides were applied at 6 days after transplanting (DAT). Data regarding weeds were recorded at 50 days after transplanting (DAT). Dry weight of weeds were taken by drying them in electric oven (Perkin-Elmer Corporation, USA) at 60^oC for 72 hours followed by weighing by digital balance (Kaifeng Group Co. Ltd., China). Weed control efficiency (WCE %) was calculated using the formula according to Rao. The grain and straw weights for each plot were recorded after proper sun drying and then converted into t ha^-1. The grain yield was adjusted at 12% moisture level. The data were analyzed following analysis of variance (ANOVA) technique and mean differences were depicted by multiple comparison test using the statistical program MSTAT-C. The contribution of an individual weed species to the weed community was determined by its two-factor summed dominance ratio (SDR). This was calculated using relative weed density (RWD) and relative dry weight (RDW).

Source of Information: Pak. J. Weed Sci. Res. 17(4):365-372, 2011

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Most of the evaluated herbicides showed above 80% weed control efficiency without showing any phytotoxicity symptom on rice crop and grain yield was above 4 t ha^-1 which is comparable to the standard herbicidal checks but weed free plots gave the highest grain yield (5.27 t ha^-1). It can be concluded that application of herbicides could be an alternative option for controlling weeds without sacrificing rice yield.

Knowledge Management: Journal